CN111828051B - Construction method of two-lining middle partition wall injection tunnel with support - Google Patents
Construction method of two-lining middle partition wall injection tunnel with support Download PDFInfo
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- CN111828051B CN111828051B CN202010737696.1A CN202010737696A CN111828051B CN 111828051 B CN111828051 B CN 111828051B CN 202010737696 A CN202010737696 A CN 202010737696A CN 111828051 B CN111828051 B CN 111828051B
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- 238000010276 construction Methods 0.000 title claims abstract description 41
- 238000005192 partition Methods 0.000 title claims abstract description 39
- 238000002347 injection Methods 0.000 title claims description 4
- 239000007924 injection Substances 0.000 title claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000010959 steel Substances 0.000 claims abstract description 117
- 239000004567 concrete Substances 0.000 claims abstract description 58
- 238000009412 basement excavation Methods 0.000 claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 230000008093 supporting effect Effects 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 238000001746 injection moulding Methods 0.000 claims abstract description 7
- 238000009415 formwork Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 21
- 238000004080 punching Methods 0.000 claims description 10
- 210000001015 abdomen Anatomy 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 2
- 238000001723 curing Methods 0.000 description 7
- 230000009191 jumping Effects 0.000 description 6
- 239000011378 shotcrete Substances 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a construction method of a two-lining middle partition wall strip-supported injection molding tunnel, which comprises the following steps: s1: designing the number and the positions of the small guide tunnels to be excavated; s2: drilling a cast-in-place pile; s3: carrying out advanced support of the tunnel; s4: performing tunnel excavation and preliminary supporting, primarily spraying concrete, supporting a steel support, and then spraying concrete on the left side surface, the right side surface, the top surface and the bottom surface of the tunnel; s5: waterproof construction of the tunnel; s6: constructing a two-lining structure wall, welding a reinforcing mesh between two adjacent vertical steel supports in the two-lining intermediate wall, pouring intermediate wall concrete by taking the vertical steel supports and the reinforcing mesh as a framework, pouring the two-lining structure wall twice, pouring floor concrete firstly, then embedding trolley steel rail bolts on a floor, installing tracks for running trolleys on the floor after the floor concrete reaches certain strength, running the trolleys, and pouring the intermediate wall, the side wall and the top wall concrete at the same time; s7: and removing the formwork and the bracket, and curing the concrete.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method of a tunnel with a supporting and injection molding of a partition wall in a two-lining manner.
Background
The main construction methods of underground line engineering include a shield method, an open excavation method and a subsurface excavation method. The shield method is mainly used for tunnel construction with good geological conditions, long lines and large curve radius. The open cut method is simple and easy to implement, but a large number of underground pipe networks and ground buildings need to be removed and maintained, normal operation and development of ground traffic and commercial activities are affected to different degrees, and much inconvenience is brought to nearby residents. The underground excavation method is suitable for various stratums which are not suitable for open excavation construction, and is particularly suitable for shallow buried tunnels constructed under the conditions that urban traffic is busy, underground pipelines are densely distributed, and the requirements on ground subsidence are strict.
The shallow-buried underground excavation method is developed on the basis of a new Olympic method aiming at the characteristics of urban underground engineering, the tunnel construction safety is ensured by auxiliary construction methods such as step-by-step excavation and advanced support, and the conventional tunnel shallow-buried underground excavation method is generally divided into a plurality of small pilot tunnels for excavation and temporary supports are erected at the same time during construction. The temporary support is then removed before the second liner is applied. Therefore, the temporary support is required to be installed and also needs to be dismantled before the construction of the second lining, the process is complicated, engineering machinery cannot be adopted due to the limitation of the temporary support, the excavation progress is severely limited, and the construction period is prolonged. The quality safety problems of vault settlement, collapse, roof fall and the like easily occur to the rectangular section tunnel, and the construction risk of dismantling the middle temporary support is high and the difficulty is large.
Disclosure of Invention
In view of the above, the invention aims to provide a construction method for a two-lining middle partition wall strip support injection tunnel, so as to solve the problems that in the prior art, the excavation progress is influenced by long time consumed for removing temporary supports when two linings are constructed, and the vault settlement, collapse and roof fall of a tunnel with a rectangular section are greatly reduced.
In order to achieve the purpose, the technical scheme adopted by the construction method for the injection molding tunnel with the support of the middle partition wall of the two linings is as follows:
a construction method of a two-lining middle partition wall injection molding tunnel with a support comprises the following steps:
s1: determining the number and the positions of the small pilot tunnels which are distributed and excavated according to the number and the positions of the designed cabins of the tunnel;
s2: drilling a cast-in-place pile, and constructing a hole fender pile at one end of the tunnel and then constructing a hole fender pile at the other end of the tunnel according to actual field conditions;
s3: carrying out advanced support of the tunnel;
s4: the method comprises the following steps of (1) excavating a tunnel and carrying out primary support, primarily spraying concrete after each excavation and scale feeding of a small pilot tunnel are completed, arranging a top transverse steel support on the top wall of the small pilot tunnel, arranging a vertical steel support on the side wall, arranging a middle vertical steel support at the position overlapped with a vertical middle partition wall, and arranging a transverse steel support on the bottom wall of the small pilot tunnel to enable each section of steel support to form a ring shape; circularly carrying out excavation supporting of other small pilot tunnels according to the small pilot tunnel excavation step, forming a steel bracket with an annular outer contour on the whole section after the small pilot tunnels are supported, and then spraying concrete on the left side surface, the right side surface, the top surface and the bottom surface of the tunnel;
s5: waterproof construction of the tunnel, lay the waterproof layer in the primary support lower floor;
s6: constructing a two-lining structure wall, namely installing two-lining structure reinforcing mesh on two sides of a temporary vertical steel support in a two-lining middle partition wall, pouring middle partition wall concrete by taking the vertical steel support and the reinforcing mesh as frameworks, pouring the two-lining structure wall in two times, pouring bottom plate concrete and wall concrete firstly, pouring a chamfer angle between a bottom plate and a wall, pouring the wall part to be more than 50cm higher than the chamfer angle, then pre-embedding trolley steel rail bolts on the bottom plate, installing tracks for running trolleys on the bottom plate after the bottom plate concrete reaches certain strength, running the trolleys, and then pouring middle partition wall, side walls and top wall concrete simultaneously to form the reinforced concrete two-lining structure wall;
s7: and removing the formwork and the bracket, and curing the concrete.
Has the advantages that: according to the invention, when the two-lining structure is constructed, the reinforcing mesh is welded between two adjacent vertical steel supports in the two-lining middle partition wall, and the vertical steel supports and the reinforcing mesh are poured in the two-lining middle partition wall as frameworks, so that on one hand, the vertical steel supports in the two-lining middle partition wall are prevented from being removed, the time spent on removing the vertical steel supports is saved, the construction progress is accelerated, and the construction period is shortened; and secondly, the vertical steel supports are poured in the two lining intermediate walls, so that the structural strength of the two lining intermediate walls can be increased, and the supporting effect of the two lining intermediate walls on the rectangular tunnel is further ensured.
Furthermore, four small pilot holes are arranged, the construction sequence of the four small pilot holes is right upper small pilot hole, right lower small pilot hole, left upper small pilot hole and left lower small pilot hole, and the steel support after the supporting of each small pilot hole is completed forms a 'field' -shaped steel support at the section.
Has the advantages that: the tunnel can be guaranteed to be excavated smoothly and safely supported under the condition that the section of the tunnel is large.
Furthermore, the middle transverse steel support of the steel bracket shaped like a Chinese character tian is dismantled before the construction of the two-lining structure.
Has the advantages that: on one hand, the trolley can conveniently enter the tunnel; on the other hand, the waterproof board is convenient to lay, and waterproof facilities are guaranteed to have a good waterproof effect.
Furthermore, the vertical steel supports and the transverse steel supports are all made of I-shaped steel, and upper and lower rows of pouring holes are formed in the abdomen of the I-shaped steel in the partition wall in the second lining.
Has the advantages that: the blocking of the flowing of the poured concrete caused by the vertical steel supports is reduced, so that the flowability of the concrete in the extending direction of the partition wall in the two linings is improved, and the concrete can be more uniformly and upwards accumulated.
Furthermore, when each row of pouring holes are punched, a mode of jumping two to make one, then jumping one to make one and finally fully punching is adopted.
Has the advantages that: satisfy the concrete and when following two lining mid-board extending direction mobility, avoid seting up the support intensity that can support vertical steel when pouring the hole and cause the influence to the support of influence to the tunnel.
When primary support is carried out, adjacent steel brackets are connected into a whole through connecting ribs arranged along the extending direction of the tunnel, and reinforcing mesh is welded on the top wall and the two side walls of each steel bracket.
Has the advantages that: the connecting ribs and the reinforcing mesh connect the steel supports, so that the steel supports, the connecting ribs and the reinforcing mesh form a tighter supporting system, and sufficient supporting strength before the two-lining structure wall is poured and sufficient safety when the two-lining structure wall is poured are ensured.
The advance support comprises a large pipe shed support and a small pipe support.
Has the advantages that: the advance support is ensured to be more comprehensive and stable, and the construction process is safer and more reliable.
Drawings
FIG. 1 is a flow chart of a construction method of a two-lining partition wall injection molding tunnel with a support of the invention;
FIG. 2 is a schematic structural view of a steel bracket according to the present invention;
FIG. 3 is a schematic view of a two-lined structural wall french according to the present invention;
fig. 4 is a layout diagram of an I-shaped steel pouring hole of a two-lining intermediate wall in the invention.
Reference numerals: 1-small pilot tunnel on the upper right; 2-small pilot tunnel at the right lower part; 3-small pilot tunnel at upper left; 4-left lower small pilot tunnel; 5-top transverse steel support; 6-middle transverse steel support; 7-bottom transverse steel support; 8-left vertical steel support; 9-middle vertical steel support; 10-right vertical steel support; 11-large pipe shed; 12-a small catheter; 13-a steel bracket; 14-a waterproof layer; 15-two lining structure walls; 16-floor concrete; 17-pouring holes.
Detailed Description
The following describes in detail a specific embodiment of the method for constructing a tunnel with a spacer in a two-lining partition according to the present invention with reference to the accompanying drawings and embodiments:
as shown in fig. 1 and 3, the construction method of the injection molding tunnel with the support of the partition wall in the two linings of the invention comprises the following steps:
first, a construction preparation is performed.
Making technical bottom-crossing and safe bottom-crossing; before construction, removing ground construction waste, leveling the site, checking the pipeline condition and the ground condition again, and determining the number and the positions of the small pilot tunnels which are distributed and excavated according to the number and the positions of the designed cabins of the tunnel, wherein in the embodiment, four small pilot tunnels are arranged, namely an upper right small pilot tunnel 1, a lower right small pilot tunnel 2, an upper left small pilot tunnel 3 and a lower left small pilot tunnel 4; constructing a construction access and drainage facility around the upper opening of the foundation pit and in the working pit; various construction machines, such as an excavator, a loader, a dump truck, a drilling machine, an anchor spraying machine, an air compressor and other mechanical equipment are equipped in place; in this embodiment, the cross-sectional shape of the tunnel is rectangular.
And secondly, drilling a cast-in-place pile, constructing a hole fender pile at one end of the tunnel firstly, constructing a hole fender pile at the other end of the tunnel secondly according to the actual conditions on site, drilling odd piles and even piles in the hole fender pile at one side, and manufacturing reinforcing steel bars and pouring concrete in the pile forming sequence.
And thirdly, performing tunnel advance support, wherein the advance support comprises a large pipe shed 11 support and a small pipe 12 support.
The advanced large pipe shed 11 is a main advanced support of the tunnel, is implemented outside a tunnel opening before the tunnel enters the tunnel, and determines to select an orifice to be provided with a sealing device 'disposable guide pipe drilling method' to construct the large pipe shed 11 according to specific conditions, namely, hole forming and support pipe laying are completed at one time.
The advanced small guide pipe 12 is used for carrying out advanced grouting consolidation and reinforcement on the vault and two sides of a subsequent soil layer by adopting a grouting pipe before the next excavation of the tunnel face, and the advanced small guide pipe 12 penetrates through the belly of the steel frame and is jacked by a special jacking head; the small guide pipe 12 is ensured to be annularly vertical to the steel support 13 by a square ruler, the radial direction is ensured to be between 5 and 10 degrees by a leveling ruler and a steel tape and the distance between the axis of the small guide pipe 12 and the axis of the tunnel to control the external insertion angle, and the tail end of the small guide pipe 12 is exposed to a sufficient length and is welded with the steel arch frame.
And fourthly, excavating the tunnel and carrying out primary support.
(1) The construction sequence of the four small pilot tunnels is right upper small pilot tunnel 1, right lower small pilot tunnel 2, left upper small pilot tunnel 3 and left lower small pilot tunnel 4, and the small pilot tunnels are initially sprayed with 4cm of concrete after excavation footage of each small pilot tunnel is finished.
(2) After the concrete is initially sprayed, as shown in fig. 2, the steel support frame of the upper right small pilot tunnel 1 is taken as an example for explanation, a top transverse steel support 5 is arranged on the top wall of the small pilot tunnel, a right vertical steel support 10 is arranged on the right side wall, a middle vertical steel support 9 is arranged at the position overlapped with the vertical mid-partition, and a bottom transverse steel support 7 is arranged on the bottom wall of the small pilot tunnel, so that all sections of steel supports form a ring shape; when the steel shotcrete of upper left little pilot tunnel 3 erects, set up horizontal steel shotcrete 5 in the roof of little pilot tunnel, set up the vertical steel shotcrete 8 in left side wall, set up the horizontal steel shotcrete 7 in bottom at the diapire of little pilot tunnel.
And then circularly carrying out excavation supporting on other small pilot tunnels according to the small pilot tunnel excavation step, wherein after the supporting of each small pilot tunnel is finished, a steel bracket 13 with an annular outer contour is formed on the whole cross section, in the embodiment, as shown in fig. 2, after the supporting of each small pilot tunnel is finished, each steel bracket forms a steel bracket 13 in a shape like a Chinese character 'tian' at the cross section, namely, the bottom transverse steel bracket of the upper right small pilot tunnel 1 and the bottom transverse steel bracket of the upper left small pilot tunnel 3 become the middle transverse steel bracket 6 of the steel bracket 13. And then, the adjacent steel brackets 13 are connected into a whole through connecting ribs arranged along the extending direction of the tunnel, and reinforcing mesh is welded on the top wall and the two side walls of the adjacent steel brackets 13, so that the steel brackets 13, the connecting ribs and the reinforcing mesh form a tighter supporting system, and the sufficient supporting strength before the pouring of the two-lining structure wall 15 and the sufficient safety during the pouring of the two-lining structure wall 15 are ensured.
In this embodiment, the left vertical steel support 8, the right vertical steel support 10, the middle vertical steel support 9, the top horizontal steel support 5, the middle horizontal steel support 6, and the bottom horizontal steel support 7 are all h-shaped steel structures.
(3) And spraying concrete on the left side surface, the right side surface, the top surface and the bottom surface of the tunnel again, wherein the concrete is sprayed for multiple times, the thickness of one-time spraying is not more than 10cm, and the thickness of one-time spraying is not more than 7cm when the arch part is sprayed.
(4) And (3) removing the temporary middle transverse steel support 6, after excavation and support of each small pilot tunnel are finished, sealing the primary support into a ring, wherein the primary support can bear all pressure of surrounding rock, the middle transverse steel support 6 can be removed at the moment, and the middle vertical steel support 9 is directly poured in the secondary lining middle partition wall and is not removed any more. The middle transverse steel support 6 is removed and cut off by electrogas welding, so that the section is smooth and flat and is not protruded, and the waterproof operation is facilitated.
And fifthly, performing tunnel waterproof construction, and paving a waterproof layer 14 on the lower layer of the primary support.
And sixthly, constructing the wall 15 with the secondary lining structure.
(1) Before the two-lining structure wall 15 is poured, because the middle vertical steel support 9 is arranged in the middle partition wall of the two linings, and gaps on two sides are smaller, concrete with high fluidity must be adopted during pouring, the grain composition is strictly controlled, and in order to facilitate the inflow of the concrete, as shown in fig. 4, a pouring hole 17 is formed in the belly of the middle vertical steel support in the middle partition wall of the two-lining partition wall, the size of the pouring hole 17 is 20 x 10cm, the pouring holes 17 are arranged in an upper row and a lower row, the upper row and the lower row of the pouring holes 17 are arranged at an interval of 1m, the lower pouring hole 17 is 50cm away from the first concrete pouring surface, and the upper pouring hole 17 is 60cm away from an axillary angle. In the pouring process, a specially-assigned person is required to check the pouring condition of the concrete through the observation window, and the vibration is enhanced in a mode of combining the insertion type vibrating rod and the attached type vibrator, so that the quality of the concrete is ensured. The pouring holes 17 are punched in rows, each row of pouring holes 17 are punched in a mode of jumping two to one, jumping one to one and finally punching completely, after one row of pouring holes 17 are punched, the other row of pouring holes 17 are formed, each punching step needs to be carried out at least 24 hours at intervals, the peripheral conditions are fully observed, the pavement settlement, the pipeline settlement, the vault subsidence and the convergence in the hole are realized, the data are stable, and the next punching operation can be carried out after the requirements are met.
(2) After the pouring holes 17 are drilled, a reinforcing mesh is welded between the two vertical steel supports in the two lining intermediate walls, the reinforcing mesh and the connecting ribs between the two adjacent steel brackets 13 during primary support are fixedly connected to form a framework structure, and the reinforcing mesh between the vertical steel supports and the vertical steel supports is used as a framework to pour the intermediate wall concrete.
(3) The secondary structure wall body is poured twice, firstly, the bottom plate concrete 16 and the wall body concrete are poured, a chamfer angle is poured between the bottom plate and the wall body, the wall body part is poured to be 50cm above the chamfer angle, then trolley steel rail bolts are pre-embedded on the upper part of the bottom plate concrete 16, after the bottom plate concrete 16 reaches a certain strength, a track for running a trolley is installed on the bottom plate, the trolley is run, and then the middle partition wall, the side wall and the top wall concrete are poured simultaneously to form the reinforced concrete two-lining structure wall body 15. The wall 15 with the two lining structures is made of C40 commercial concrete, the concrete is pumped by a ground pump and poured into a mould for casting, the bottom plate concrete is vibrated and compacted by an inserted vibrator, and the side wall and the top plate concrete are vibrated outside the mould by an attached vibrator.
And seventhly, removing the formwork and the support, and curing the concrete.
After the concrete is poured and initially set, timely curing is carried out, and watering covering curing is usually adopted, and a water spray curing method is preferably adopted. The maintenance method is suitable for the change of construction seasons: generally, the concrete is maintained in a wet state for more than 5-7 days by covering, sprinkling and curing.
Concrete pouring and curing time: concrete mixed by Portland cement, ordinary Portland cement or slag Portland cement is not less than 7 days; the addition of retarding admixture or concrete with impervious requirement is not less than 14 days.
When the two-lining structure is constructed, the middle vertical steel support 9 is poured in the two-lining middle partition wall as a framework, on one hand, the vertical steel support in the two-lining middle partition wall is prevented from being removed, and the time spent on removing the vertical steel support is saved, so that the construction progress is accelerated, and the construction period is shortened; secondly, because the rectangular section tunnel is very easily taken place the vault and subsides, quality safety problems such as roof fall, the roof fall, demolish the construction risk that the middle interim propped high, the degree of difficulty is big, pour vertical steel support in two lining mid-diaphragms, can increase the structural strength of two lining mid-diaphragms, further guaranteed two lining mid-diaphragms to the supporting effect in tunnel, reduced the emergence probability that rectangular section tunnel vault subsides, the roof fall etc. problem by a wide margin.
In addition, in order to reduce the blocking of the vertical steel supports to the flowing of the poured concrete and ensure the flowability of the concrete along the extending direction of the two-lining middle partition wall, the abdomen of the middle vertical steel support 9 in the two-lining middle partition wall is provided with an upper row of pouring holes 17 and a lower row of pouring holes 17, so that the serious interference of the middle vertical steel support 9 to the flowability of the poured concrete is avoided, the same pouring time and the same solidification time of the concrete at the same height are ensured, and the pouring quality of the two-lining middle partition wall is ensured.
In the embodiment, four small pilot holes are arranged, the construction sequence of the four small pilot holes is right upper small pilot hole, right lower small pilot hole, left upper small pilot hole and left lower small pilot hole, and the steel support after the support of each small pilot hole is completed forms a 'field' -shaped steel support at the section; in other embodiments, the small pilot tunnels are arranged in a left-right adjacent mode, the two small pilot tunnels are constructed in sequence, and the outer contour of the steel support after the two small pilot tunnels are supported is annular.
In the embodiment, the vertical steel supports and the transverse steel supports are both made of I-shaped steel, and the abdomen of the I-shaped steel in the middle partition of the second lining is provided with an upper row of pouring holes and a lower row of pouring holes; in other embodiments, a row of pouring holes are formed in the abdomen of the I-shaped steel in the middle partition of the two linings.
In the embodiment, the pouring hole is punched in a mode of jumping two to beat one, then jumping one to beat one and finally fully punching; in other embodiments, the pouring hole is punched by firstly punching three times, then punching two times, and finally picking one time and finally fully punching.
Claims (4)
1. A construction method of a two-lining middle partition wall injection tunnel with a support is characterized by comprising the following steps:
s1: determining the number and the positions of the small pilot tunnels which are distributed and excavated according to the number and the positions of the designed cabins of the tunnel;
s2: drilling a cast-in-place pile, and constructing a hole fender pile at one end of the tunnel and then constructing a hole fender pile at the other end of the tunnel according to actual field conditions;
s3: carrying out advanced support of the tunnel;
s4: the method comprises the following steps of (1) excavating a tunnel and carrying out primary support, primarily spraying concrete after each excavation and scale feeding of a small pilot tunnel are completed, arranging a top transverse steel support on the top wall of the small pilot tunnel, arranging a vertical steel support on the side wall, arranging a middle vertical steel support at the position overlapped with a vertical middle partition wall, and arranging a transverse steel support on the bottom wall of the small pilot tunnel to enable each section of steel support to form a ring shape; circularly carrying out excavation supporting of other small pilot tunnels according to the small pilot tunnel excavation step, forming a steel bracket with an annular outer contour on the whole section after the small pilot tunnels are supported, and then spraying concrete on the left side surface, the right side surface, the top surface and the bottom surface of the tunnel;
s5: waterproof construction of the tunnel, lay the waterproof layer in the primary support lower floor;
s6: constructing a two-lining structure wall, namely installing two-lining structure reinforcing mesh on two sides of a temporary vertical steel support in a two-lining middle partition wall, pouring middle partition wall concrete by taking the vertical steel support and the reinforcing mesh as frameworks, pouring the two-lining structure wall in two times, pouring bottom plate concrete and wall concrete firstly, pouring a chamfer angle between a bottom plate and a wall, pouring the wall part to be more than 50cm higher than the chamfer angle, then pre-embedding trolley steel rail bolts on the bottom plate, installing tracks for running trolleys on the bottom plate after the bottom plate concrete reaches certain strength, running the trolleys, and then pouring middle partition wall, side walls and top wall concrete simultaneously to form the reinforced concrete two-lining structure wall;
s7: removing the formwork and the bracket, and curing the concrete;
the construction sequence of the four small pilot tunnels is right upper small pilot tunnel, right lower small pilot tunnel, left upper small pilot tunnel and left lower small pilot tunnel, and the steel support after the support of each small pilot tunnel is finished forms a 'field' -shaped steel support at the section;
before the construction of the secondary lining structure, the middle transverse steel support of the steel bracket shaped like the Chinese character 'tian' is dismantled;
the vertical steel supports and the transverse steel supports are all made of I-shaped steel, and upper and lower rows of pouring holes are formed in the abdomen of the I-shaped steel in the partition wall in the second lining.
2. The method as claimed in claim 1, wherein the holes are punched in each row by a method of punching one by two, then one by one and finally full punching.
3. The method as claimed in claim 1 or 2, wherein the adjacent steel frames are integrally connected by the connecting rib disposed along the extending direction of the tunnel, and the reinforcing mesh is welded to the top and both side walls of the steel frames during the preliminary bracing.
4. The method for constructing the injection molding tunnel with the support of the partition wall between the two linings according to claim 1 or 2, wherein the advance support comprises a large pipe shed support and a small pipe support.
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|---|---|---|---|---|
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